采用外加表面活性剂类添加剂的方法来改善碳酸化分解产物的粒度和强度, 并探讨了其作用机理. 结果表明, 适宜的添加剂及添加量能够明显减少产物中的细粒子含量, 加强附聚过程的进行, 改善产物Al(OH)3的强度. 添加剂CF2在200 mL/L时,产物平均粒径提高12 m左右, 小于45 m细粒子质量分数降低17%左右, 磨损指数降低10%. 结晶形貌分析表明, 添加剂促进了晶粒的附聚和单晶间的交互生长, 产物氢氧化铝形成近似球形的“镶嵌”式多晶体.
The problems related to the product strength and fine particle content are the main tasks to be solved in sandy alumina production. Carbonization product, Al(OH)3, was investigated through the application of additives to sodium aluminate liquors. A systematic study was made of the effects and mechanism of surfactants on product median diameter and attrition index quantitatively. It has been determined that some appropriate additive at certain concentration can significantly decrease the fine particle content, enhance the agglomeration process, and improve the product strength. For instance, additive CF2 at 200 mL/L increases the mean particle size by about 12 μm, decreases the content of particles with less 45 μm by 17% and the attrition index by 10% respectively. The crystal morphology indicates that the additives can accelerate the aggregation and inter-growth of crystal units, as a result, the product Al(OH)3 presents a mosaic crystal structure close to global shape.
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